Revert "Revert "DiskStats Westworld Migration""

This reverts commit 6188aa32.

Reason for revert: ag/4819964 has now been submitted. undoing the roll back.
Test: revert
Test: manually verified output is the same as diskstats.

Change-Id: I9a3292f66e1e28661e1d29f3befd002073b681c1